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Problem with date range in a query criteria

Posted on 2014-03-17
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Last Modified: 2014-03-20
I'm using this in query designer and not getting the correct result:

Between [Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtStart] And [Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtEnd]

So I'm wondering if my syntax is incorrect.

Is there a better way to capture data between two dates?  Or?

--Steve
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Question by:SteveL13
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LVL 50

Expert Comment

by:Rgonzo1971
ID: 39934358
Hi,
try to convert your string Dates in dates first before comparing them

DateValue([MyField])

Open in new window

Regards
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Author Comment

by:SteveL13
ID: 39934371
Where and how do I do that?
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COACHMAN99 earned 500 total points
ID: 39934538
Between DateValue([Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtStart] ) And DateValue([Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtEnd])
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Author Comment

by:SteveL13
ID: 39934603
Ok.  This is working.  But why?
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Expert Comment

by:PatHartman
ID: 39934775
The dates in your table include time and so that is interfering with the criteria.  The DateValue() function strips out just the date part of the field.  If you really don't want to store time as well as date, change your default and/or code to use Date() rather than Now().  Then write an update query using the DateValue() function to replace all the values with only the date.

To allow for dates to contain time and not use the DateValue function, you have to add a day to the end date.

YourDate >= FromDate and < EndDate +1

The problem is with the EndDate
YourDate = 1/1/2014 11:35:33 AM
FromDate = 1/1/2014
EndDate = 1/1/2014

The time parts of the From and End dates are 00:00:00 AM
So YourDate is >= FromDate
but
YourDate is NOT <= EndDate because of the time.  The time part makes it > the EndDate.
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Expert Comment

by:Gustav Brock
ID: 39934802
It's rather that

    [Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtStart]

returns a string value while

    DateValue([Forms]![frmSelectLocationAndDatesForProductSalesReport]![txtStart])

returns a (you guessed it) a date value.

/gustav
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Expert Comment

by:PatHartman
ID: 39935015
Referencing the control only returns a string if the control is unbound and  therefore not defined as a date/time data type.

The DateValue() solves the problem of stripping time out of a date/time field so you can do your compare using only the date part of the value.  If you want just the time part, you would use TimeValue().  Remember, dates are stored as double precision numbers.  DateValue() returns the integer and TimeValue() returns the decimal.
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